Vertex Standard FT-857 Operating Manual page 25

by automotive ignition systems.
1. Press the [F] key momentarily, then rotate the MEM/VFO CH knob, as needed, until Multi Function Row "l" [NB,
AGC, OFF] appears on the display.
2. Press the [A](NB) key to activate the Noise Blanker. Parentheses will appear on both sides of the "NB" selection,
indicating that the Noise Blanker is now on.
3. To adjust the blanking level, press and hold in the [A](NB) key for one second. This instantly activates Menu Mode
No-063 [NB LEVEL], which allows adjustment of Noise Blanking Level. Rotate the DIAL knob to set a higher or
lower blanking level (on a scale of 0 to 100). When done, press and hold in the [F] key for one second to save the new
setting and return to normal operation.
4. Press the [A](NB) key again to turn the Noise Blanker off.
The IPO feature bypasses the receiver RF preamplifier, thereby eliminating the preamp's gain. This feature is not
available on the 144 MHz and 430 MHz bands.
1. Press the [F] key momentarily, then rotate the MEM/VFO CH knob, as needed, until Multi Function Row "m" [IPO,
ATT, NAR] appears on the display.
2. Press the [A](IPO) key to bypass the receiver input preamplifier. Parentheses will appear on both sides of the "IPO"
selection, and the "IPO" icon will appear on the display. indicating that the preamp is now disengaged from the
receiver circuit.
3. Press the [A](IPO) key once more to re-activate the preamp.
On the bands below 14 MHz, the input preamplifier is rarely necessary, and activation of the IPO feature will provide
substantial protection against intermodulation and other problems associated with strong signal input to the receiver. Rule
of thumb: so long as the S-meter is moving on background noise, additional front-end gain is not necessary.
The Attenuator will reduce all signals (and noise) by 10 dB, and it may be used to make reception more pleasant under
extremely noisy conditions. This feature is not available on the 144 MHz and 430 MHz bands.
1. Press the [F] key momentarily, then rotate the MEM/VFO CH knob, as needed, until Multi Function Row "m" [IPO,
ATT, NAR] appears on the display.
2. Press the [B](ATT) key to activate the Attenuator. Parentheses will appear on both sides of the "ATT" selection, and
the "ATT" icon will appear on the display.
3. Press the [B](ATT) key once more to switch the Attenuator out of the receiver front end circuit. Signals will again be
received at a level 10 dB louder than was the case when the Attenuator was engaged.
IPO (Intercept Point Optimization)
ATT (Front End Attenuator)
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FCC ID: K66FT-857
Operating Manual
Vertex Standard Co., Ltd.